Launching of boats from ships.



J. C. SNELLING.

LAUNCHING 0F BOATS FROM SHIPS.

APPLICATION FILED JUNE 23. 19.15.

1,216,868. Patented Feb. 20, 1917.

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I l l l I I l I I l I I I J. C. SNELLlN-G.

LAUNCHING 0F BOATS FROM SHIPS.

APPLICATION FILED JUNE 23. 1915.

1 ,21 6,868. Patented Feb; 20, 1917.

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Patented Feb. 20, 1917.

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J. C. SNELLING LAUNCHING 0F BOATS FR0M';SHIP S. I APPLICATION FILEDJUNE23, 1915. v 1,216,868. Patented Feb. 20,1917.

- 6 SHEETS-SHEET 4.

.J. C. SNELLING.

LAUNCHING 0F BOATS FROM SHIPS. APPLICATION FILED sum: 23, 19:5.

1,216,868. Patented Feb. 20, 1917;

6 SHEETS-SHEET 5.

J. c. SNELLING. LAUNCHING 0F BOATS FROM SHIPS.

- APPLICATION FILED JU N23, I9I5.

' 1,216,868. v ,Patented- Feb. 20, 1917.

6 SHEETS-SHEET}.

JOHN o. SNELLING, or w Nnswon'rn, LONDON, ENGLAND.

LAUNGHING F BOATS FROM SHIPS.

Specification of Letters Patent.

Patented Feb. 20, 19137.

Application filed June 22, 1915. SeriaINo. 35,827.

To all whom it may concern Be it known that I, JOHN CHARLES SNELLING, asubject of His Majesty the King of England, residing at l/Vandsworth, inthe county of London, Kingdom of England, have invented certain new anduseful Improvements in or Relating to the Launching of Boats from Ships,of which the following is a specification.

This invention relates to improvements in, or relating to, the launchingof boats from ships, and it refers more specifically to launching gearof the kind in which the boats are stored in a plurality of differentpositions on the deck or other part of a ship each group being withinreach of a common derrick which is mounted on a turntable.

Now according to the present invention each launching set comprises adouble control box or platform having two turntables mounted thereon,each carrying a separate and independently controlled derrick so thatall the boats within reach can be readily launched at will from eitherside of the boat as hereinafter described.

In the accompanying drawings with reference to which the presentinvention is hereinafter described Figure 1' is a partial side elevationof a ship showing two sets of double derricks constructed according tothis invention;

Fig. 2 is a corresponding plan view;

Fig. 3 is a diagrammatic end elevation;

Fig. 4 is a detail sectional view of the double control box or platform;

Fig. 5 is a corresponding plan view;

Fig. 6 is a detail side elevation of one of the derricks; and V Fig. 7is a corresponding plan view.

According to the present invention I provide for each launching set adouble control box or platform (2 upon which two derricks b I) aremounted. The two platforms 0 c which surmount or form the top of eachcontrol resemble turn-tables and they are mounted side by side uponcentral bearing bushes d cl and upon outer rollers e e as shown in Fig.4.

The derrick arms 7) b are preferably formed of steel tubes and they aresplayed out as shown at f f and g g to provide yoke pieces. The lowerends of the yoke pieces f f are connected at diametrically oppositepoints it h to their respective turntables 0 a and the upper ends of thearms 9 g are connected by steel cross braces i z" and serve to supportthe shackles y for the boat whips 7c the topping bridle Z and thetopping lift m. Steel wire stays or ties n are provided to take thestrains and these ties may conveniently be stretched or connectedbetween the outer end of the derrick tube proper and the spaced ends itof the splayed out lower arms f one on each side.

The lifting strain of both derricks is adapted to be taken by a commonderrick mast 0 which is secured to the intermediate fixed portion of thecontrol box or platform a. Supported from the base portion of this mast0 are a pair of upwardly, outwardly and forwardly extending auxiliaryjibs or struts p which are braced together at their upper ends by meansof two other tie rods 9 extending horizontally from the upper end of themast 0 and forming, with a further horizontal bar 4 connecting the upperends of the two jibs p a triangle. I The topping lift m for the derrickspasses over sheaves 8 provided at the upper ends of the auxiliary jibs pand down to the winding drums which may be arranged within the controlbox and controlled ,in any convenient manner. The boat whips pass oversheaves 2% through a fairlead u and over sheaves '0 to the winding drumsto.

With the transverse arrangement of the control box and the derrickarrangement carried thereby it will be possible for all the boats :10 tobe handled and launched from either side by either of the derricksshould one of them get damaged or be otherwise out of order.

What I claim as my invention and desire to secure by Letters Patent ofthe United States is 1. In the launching of boats from ships, 7

the combination with a turn-table, of an inclined derrick arm providedwith splayed terminal portions forming upper and lower yokes, the loweryoke being mounted on the turntable at diametrically opposite points andthe upper yoke being provided with a I tables and located opposite eachother, a

ends of the jibs with each other, diverging braces connecting the upperends of the jibs with the mast and topping lifts connected with the jibsand the derrick arms.

'3. In the launching of boats from ships,

the combination with a platform, of a pair of turntables surmounting theplatform, inclined derrick arms provided at their upper I and lower endswith yokes, the lower yokes being mounted upon the turntables and theCopies of this patent may be upper yokes having connecting braces, a

Vmast common to both derrick arms and mounted upon the platform betweenthe turntables and beyond the'plane which intersects the centers of theturntables, inclined diverging jibs extending from the mast to pointsabove the center of the turntables, braces connecting the upper ends ofthe jibs with each other and with the mast, bridles supported by theconnecting braces of the said upper yokes, boat whips arranged in pairsand carried by one set of bridles, and topping lifts connected with theother set of'bridles and the jibs.

In testimony whereof I have signed my name to this specification.

JOHN C. SNELLING obtained for five cents each, by addressing theCommissioner of Patents,

Washington, D. G.

